Chimney



June a, 1930. cfw. DA IS 1,761,616

CHIMNEY Original Filed July 25, 1927 --OOOOO INVENTOR kmw W 4] ATTORNEY.

Patented June 3, 1930 UNITED STATES' PATENT OFFICE CORTLAND W. DAVIS, or OAK PARK, ILLINoIsAssIeNoR TO THE MANTLE LAMP com- PANY or AMERICA, or CHICAGO, rumors, A oonronArronor rumors CHIMNEY Original application filed July 25, 1927, Serial No. 208,286. Divided and this application filed. October 18,

1928. Serial This application is a division of the application of Cortland W. Davis, #208,286, for a blue-flame mantle lamp, filed July 25, 1927, in which are revealed several improve- .ments all of which cooperateto control the functioning of the burner with which a lamp of that type is provided, whereby it is possible to reduce the creeping or working-up tendency of the flame, to obtain a full light from the lamp in a short period of time, and

Y torenderthe operation of the lamp stable and reliable.

. Among these several features of construction are a new chimney and its retaining means, a new flame spreader, a new burner cone constructlon, a new flame-protect ng battle, and a new mantle supporting means. V The disclosure and the claims of this ap plication relate to the new chimney and its retaining means.

Experiments have proved that, in the operation of a lamp of the blue-flame type,

heated gases accumulate in the annular space around the burner cone and the mantle, and

' that retention of such heated gases in this that means be provided for maintaining, at all times, the quantity of air admitted at that point. p This supply of air assistsin keeping the burner, as a whole, in a cool condition, and increases the stability of the lamp. EX- periments have also shown that, when too much air is allowed to enter at the chimney base, the normal draft of the chimney will be checked, the normal blue flame will become semiluminous and carbon will be deposited on the mantle and still further impair the draft of the lamp.

The base of a chimney,'such as usually employed on a blue-flame burner, is of cylindrical form, and the chimney is held in position on the gallery by aseries of upwardlyprojectingfingersacting with spring tension on the lower part. One means for allowing airto enter into the space between the chim- 7 down to its supporting ribs, the spring ten-7 sionof the fingers being sufficient to frictionally sustain the chimney. Undersuch a condition a greater amount of air passes under thechimney and into the space outsideof the mantle, than is desirable. for the eilicient operation of the burner. frequentlyhappens that the chimney becomes slightly tilted to one side, thuspermitting a greaterintroduction of air at one side than the other Thiscorrespondingly reduces the eficiency of the burner. It has i also been found that'the lingers of the chim neyband, due to their proximity to the mantle, becomelii ghly. heated and transmit heat to the other burner elements. r 1

One object of this invention is, therefore, to provide a" chimney for a burner of the blue-flame type, which isso' constructed as, in and of itself, to. accurately determine the quantity of air admitted at its base to the space within it; and, also, to provide securing means which compels it to assume its proper and true position on the burner.

The invention will be bestunderstood if the following specification is considered in connection with the accompanying drawing,

in which I Figure 1 shows afront elevation of a portion ofthe burner, parts being broken away to reveal an air passage at the base of the chimney;

Figure 2 is a plan view showing the chimney secured in position on the gallery of the v burner;

It also er a The gallery 6 has a chimney band 41, having perforations 41 and a plurality of inwardly-projecting prongs 42. The base of the chimney 43 is provided with a plurality of downwardly-projecting lugs 44, and the chimney is secured in position on the gallery 6 by the prongs 42 engaging spaced external beads 45 disposed at the base of the chimney. When the chimney is locked in position on the gallery of the burner, the spacing lugs 44 support the chimney at a fixed distance above the gallery deck 46 and provide a clearance space 47 for the passage of air entering through perforations in the gallery band. The air thus admitted flows ver the deck of the gallery, as shown by the arrows (Figure 1), and into the space inside of the chimney and outside of the incandescent mantle and the burner cone.

The spaces 48 between the beads 45 are sufficiently wide to admit the prongs 42, so that the chimney may be entered into the gallery past these prongs. The tops of the beads 45 are slightly tapered, as shown in Figures 3, 5, so that when the chimney is inserted and turned, the prongs 42 will ride over and tighten on said ribs to firmly hold the chimney in position.

By extending the downwardly-projecting lugs 44 at the base of the chimney below the bottom of the chimney a correct distance, it is possible to establish a predetermined clearance between the underside of the chimney and the top of the gallery deck 46, and allow for an air pasage at this point of any desired capacity. 7 This clearance space will be definitely established each time the chimney is placed in position in the gallery, as it is impossible to operate the bayonet catch mechanism for supporting the chimney in the gallery without first properly putting the chimney in position on the gallery deck 46 with the protruding lugs 44 resting on the deck of the gallery.

In the operation of a blue-flame burner fitted with an improved chimney in accord ance with this invention, currents of air are induced to flow under the chimney by the draft of the chimney as shown by the arrows (Figure 1), and these currents of air prevent stagnation of heated gases in the space 49 and assist in the combustion of fuel vapors at the meshes of the mantle 30. It will be noted that it will be impossible for a user to improperly position this chimney in the gallery or tilt the chimney to one side, the prongs 42 and the beads 45 forming a bayonet catch which very securely and definitely holds and positions the chimney in its proper relation to the gallery.

The lugs 44 are in contact with the relatively cool lower end of the chimney, and hence receive and transmit to the gallery 6 very little heat; also, the perforations 41 of the chimney band 41 admit the air which passes under the chimney and aid in cooling these several parts. This construction possesses a thermal utility which is not derivable from other constructions wherein the chimney-retaining fingers extend upward and are in contact with a highly-heated part of a chimney, it being desirable to keep the extraneous parts of a blue-flame burner as cool as possible so that internal parts, including the wick tubes, will not be environed by hot elements which prevent said internal parts from losing acquired heat, and thus to become unduly heated.

A modified form of the chimney is shown in Figure 5, in which the heads at the bottom of the chimney are solid, while the beads on the chimney, as shown in Figures 1, 2, 3 are hollow. Both types of chimney function in the same manner on a burner. The beads and lugs at the bottom of the chimney, shown in Figures 1, 2, 3, are made by reheating the bottom of a straight-sided chimney and crimping the bottom edge while hot to form the beads and projecting prongs, while the beads at the bottom of the modified chimney shown in Figure 5, are made solid by a press and blow operation at the time the chimney is made.

In the making of either type of chimney, the process of forming the bottom, which consists in forcing the glass outward against either a mold or a crimping machine, makes it possible to definitely size to a predetermined diameter, the inside wall of the chimney base, to thereby secure a correct clear ance for air currents, not only under the chimney, but also upward inside the chimney and between it and the perforated cylinder carried by the gallery.

The air adjustments of a blue flame burner employing a mantel must be very carefully made and maintained, the accuracy of these air adjustments being a great deal more important with such burners than they are in the case of the ordinary open-flame burners. It is, therefore, very essential that the chimneys for blue-flame burners shall have a base which is accurately made. The bottom of such a chimney, when in position on the burner, acts in conjunction with the gallery to determine one of the air adjustments of the burner. A satisfactor chimney for blueflame burner must have the plane of its base perpendicular to the axis of the chimney, and its lower edge must be smooth and devoid of such irregularities as are made in what is known as the cracking off process. It will be seen, therefore, that it is more expensive to make the base of the chimney for a blueflame burner than it is to make a chimney for an open-flame burner wherein irregularities of the base are less important. Furthermore, the method of making the chimney base disclosed by this invention is one which insures the production of a satisfactory chimney base forblue-flame mantle lamps by a relatively economical process. 7

Having thus described my invention, what I claim is: 1. A chimney having spaced locking ribs at its lower end, and downwardly-projecting lugs for spacing the lower edge of said chim ney from the gallery of a lamp.

2. A chimney having spaced ribs at its 10 lower end, and downwardly-projecting lugs coninciding with the spaces between said ribs for spacing the lower edge of said chimney from the gallery of a lamp.

3. A blue-flame lamp having a gallery and chimney-retaining fingers extending from said gallery, combined with a chimney having downwardly-projecting lugs for spacing the lower edge of said chimney from said gallery, and having also locking means engaging said fingers. V

4. A blue-flame lamp having a gallery and chimney-retaining fingers extending inward above said gallery, combined with a chimney having downwardlyprojecting lugs for spacing the lower edge of said chimney from said gallery, and having external ribs engaging said fingers.

5. A blue-flame lamp having a gallery, and

a ringencircling said gallery and provided with chimney-retaining fingers extending inward above said gallery, combined with a chimney having downwardly-projecting lugs for spacing the lower edge of said chimney from said gallery, and having also external ribs engaging said fingers.

6. A blue-flame lamp having agallery, and a perforated ring encircling said gallery and provided with chimney-retaining fingers extending inward above said gallery, combined 4:; with a chimney having downwardly-projecting lugs for spacing the lower edge of said chimney from said gallery, and having also external ribs engaging said fingers.

7. A chimney for burners of the blue-flame Wick type, having locking ribs disposed proximate the lower end thereof and remote from the path of radiant heat propagated from the burner with which the chimney is to beused, and having also downwardly-projecting lugs at its lower extremity for spacing said chimney from the gallery of said burner.

8. A chimney for a blue-flame incandescent lamp, including spaces for the admission of air at its lower end and locking ribs disposed.

5;? adjacent said spaces. 7

In testimony whereof I aflix my signature.

CORTLAND W. DAVIS. 

